We just released version 2018.1 of both Tableau Desktop and Server this week. Which means it's now time to kick off the 2018.2 Beta which comes with a number of features. It's worth noting that while in Beta it's possible a feature may not make it to release if something unforeseen crops up. The 1st Beta for 2018.2 is now available for download: Welcome to Tableau's Pre-Release and User Research Community

For the upcoming 2nd Beta of 2018.2 (which will be a number of weeks out since we just made the 1st Beta available) it looks like they're hoping to include that:

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ISO-8601 standard weeks - We've brought ISO standard calendar support to Tableau. You can now use ISO-8601 defined weeks in calculations and visualizations for better calendar-based analysis.